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Advisory record · GHSA-66wr-7vmr-p5jq

Payload authentication token field handling issue

CVSS 9.2 CriticalCriticalEPSS 0.0055 · 46th percentile

Critical, because:

  • CVSS score 9.2: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 7 Oct 2026, 20:28 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
payloadnpm>=3.0.0, <3.90.0 || >=4.0.0-canary.0, <4.0.0-canary.343.90.0, 4.0.0-canary.34
Identifiers
GHSA-66wr-7vmr-p5jq · CVE-2026-105863
Weakness (CWE)
CWE-290 · CWE-915
Tags
Published
7 Oct 2026
Updated
7 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The npm package payload, versions from 3.0.0 before 3.90.0 and from 4.0.0-canary.0 before 4.0.0-canary.34, can include unintended values in the authentication token issued at login under certain field configurations. The source says an installation is affected when it configures a custom field option that maps a field to a reserved authentication claim name; the source does not describe what an attacker can do with this beyond that. Upgrade payload to 3.90.0 or 4.0.0-canary.34, as no complete workaround is given.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.2 Critical 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0055, the 46th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:33 UTC First seen by agentprime
  2. 31 Oct 2026, 13:33 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.